Muffler.



o. F. vPBRSSON.

MUFPLER.

APPLICATION FILED s221212, 1912.V

f l mu fio UNITED sTATEs rATENT oFFIoE.

OTTO F. PEBSSONQOF ERIE, PENNSYLVANIA, ASSIGNOR TO GENERAL EILECELRICv l. COMPANY, A CORPORATION OF NEW YORK.

MUFFLER.

To all 'whom it may qoncern: Be it known that I, OTTO F. PERssoN, a citizen of the Uni-ted btates, residing at Erie, county of Erie, State of Pennsylvania, have invented certain new and useful Improvements in Mutllers, of which the following is a speciiication.`

This invention relates to devices for deadening the sharp explosive sound of the eX- haust from engines driven by expansive fluids, such as steam or gas.l

The object of the invention is to simplify the' construction of such a muttler, enabling l it to be built upto any desiredv length by assembling '-a plurality of similar sections. Each section may be a casting of simple construction, and when a number of them are grouped in proper angular relations, a tortuous passage` is formed which eHect-ually silences the noise of :the expanding gases. The referred form of Asection is a short cylin er having a bell at one end to receive the small end of the next section. 'Midway of the section is a artition having a central hole to lit alength) of tubing on which the several sections a1e..grouped. At one point in said partition is aj radial opening. Along y :one edge ofsaid opening is a flange extending a little beyond'ne end of the section and along the other edge is a similar `ange extending a trifle beyond the other end of said section. When the sections are assembled,

the. flanges of one section slightly overlap those of the adjacent sections, and in this manner a helical passage is formed concentr'ic .with the central tube. y At suitable points along said tube; holes are provided to admit the exhaustgases from said tube to 45. "fa diametrical -line omitting the central tube,

the tortuous passages/through the sections, from which they escape at one end of the filer.

In the accompanying'drawings, Figure l is a longitudinal section ofV my improved muffler. Fig. 2 is an isometric view of one of the sections.' 'Figf is a detail section on and Fig. 4 is a crossfsection; the last three figures being on a larger scale than Fig. 1.

The muiiier comprises a central tube 1, on which are mounted heads 2, 3, between which areclamped the plurality of similar sections 4, which make up the muffler proper. The exhaust gases enter the tube at one en d and may beV permitted to assthrough without muliling by opening t e cut-out valve 5 at Specicationof Letters Patent.

Patented Feb. 17, 1914.

Application led September 12, 1912. Serial No. 719,907.

the other end. Ordinarily, gases ind their way through a pluralityof holes 6 intosome or all of the sections 4, and escape finally to the atmosphere by the openings 7 in the head 3.

Each section 4 is cylindrical, having a short body 8 provided at one end with a rabbet 9.and at the other with a bell 10 to receive the rabbet on the next section.' A

however, the

'packing 11 of asbestos wicking or the likeis interposed in the joint between adjacent sections. A partition 12 extends across each section, preferably midway thereof, being provided with a central hole 13 to lit the tube 1. The body 8 forms. as it were, a rim about the partition or diaphragm 12. At one side is a radial opening 14 extending preferably from the central hole 13 to the body ori rim 8. A radial flange or lip 15 extends ,along each edge of the' vopening 14 for its entire length. the two Hanges being turned in opposite directions, and their outer' edges' projecting slightly bevond the ends of` the section. The result is that when a number of sections are assembled on the tube l and turned'until their anges 15 come in contact, said flanges overlap a little, as shown in Fig. 3. f The openings 14 are thus grouped around the tube 1, being angularly displacedY inA regular order. There is; formed by this construction a continuous passage through the muiiier, the

gases making nearly a complete circle in each section before passing to the next, and proceeding therefore, in a substantially helical Yfashion around the' tube to the lust section, .from which they escape through .the openings in the head 3, without appreciable noise. It will be seen that thelength of the path of the gas thus escaping differs greatly between the left-hand and the right-hand ends of the muier. The portion ofthe gas leaving the inner tube 1 throughfthe numerous'holes at its left-hand endhas to travel practically fifteen times around'said inner tube; the next portion has to travel fourteen times around the inner tube 1; anotherportion thirteen times; and so on- Thus while the various portions'of gas escape through the holes 6 at about the same time, they are finally discharged through the holes 7 in succession. The result is that the part-s into which the sound wave of each exhaust discharge is broken up interfere, and the wave for each' exhaust is flattened out so that the final discharge takesplace with a lowhissing sound. In this Way annoyance from the exhaust is obviated Without imposing any'substantial amount of back pressure on the engine.

In accordance with the provisions of the patent statutes, I have described the principle of operation of my invention, together` with the apparatus ,which I new' consider to represent the best embodiments thereof; but I desire to have it understood that the ap` paratus-sho'ivn is only illustrative, and that the'invention can be carried out by other means. f l

W'hat I claim as new and desire to secure by Letters Patent ofthe United States, is: '1.4 A niuiiler composed of a'plurality of similar sections fitting together, each of said sections comprising a rim and partition means extending across itf/ and having opening therein tor communication with an adjacent section, and there being means c'ofoperating with the partitions and the rims to formY annular passages between adjacent'J partitions and also means for obstructing adjacent passages on opposite sides of the opening-aforesaid in the partition which separates them. i

2. A muffler composed of plurality of similar sections litting together,y each et' said vsections comprising a rim and partition means extending across it and having an opening therein-for communication With "an adjacent section, and there being means co-v operating` with the partitions and the rims to form annular passages between adjacent partitions and also means tor obstructing adjacent passages on opposite sides of the :of said opening;

openings aforesaid in the partition 4which separates them, .said sections and the openings aforesaid being angularly displaced with reference to one another in regularorder.

3. A inuflier composed of a plurality of similar `sections fitting together,` each sec-V tion having a' cylindrical body or rim, a partition extending across it, a radial opening in said partition, and flanges extending in opposite directions from the opposite edges 4. 'A section for a inuflier having a'sliort cylindrical body or riin with a rabbet at one end and yabell at the other,-'a'partiti)n ex'- tending across said body and having a central hole, a radial opening extending fronr said hole to said body, and ilanges along the opposite edges of said opening turned in opposite directions and projecting slightly` beyond lthe ends of said body.

muffler composed of .a central tube provided I with holes, and a plurality' of similar sections grouped on said tube and #fittedv together, each section comprising a riinand partition means extending across it and communicating with the next by a radial opening having flanges Which cooperate with those on the adjacent sections, so tha the gases pass around said tube in eac i section.

In Witness whereof, I have' hereunto set my iand this 9th day of September 1919..

v OTTO PERSSON.

Yitnessesz l -v Domain WEAVER,

WV. S. CARROLL. 

